Pyrite | Level 9

## proc lifetest Brookmeyer-Crowley confidence interval for median: conftype=?

if I want calculate BrookMeyer-Crowley confidence interval for the medial survival, must I set CONFTYPE = LINEAR?

How do I know the confidence interval I got is Brookmeyer-Crowley CI?

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Accepted Solutions
SAS Employee

## Re: proc lifetest Brookmeyer-Crowley confidence interval for median: conftype=?

The LIFETEST documentation under Details => Breslow, Fleming-Harrington and Kaplan-Meier Methods specifies that all the confidence intervals are based on Brookmeyer and Crowley.   Here is the paragraph from the documentation:

"Brookmeyer and Crowley (1982) have constructed the confidence interval for the median survival time based on the confidence interval for the S(t). The methodology is generalized to construct the confidence interval for the 100pth percentile based on a g-transformed confidence interval for S(t)  (Klein and Moeschberger 1997). You can use the CONFTYPE= option to specify the g-transformation. "

2 REPLIES 2
SAS Super FREQ

## Re: proc lifetest Brookmeyer-Crowley confidence interval for median: conftype=?

Look here:

Brookmeyer and Crowley Confidence Intervals?
Posted 11-02-2019 11:00 PM
https://communities.sas.com/t5/Statistical-Procedures/Brookmeyer-and-Crowley-Confidence-Intervals/td...

Kind regards,

Koen

SAS Employee

## Re: proc lifetest Brookmeyer-Crowley confidence interval for median: conftype=?

The LIFETEST documentation under Details => Breslow, Fleming-Harrington and Kaplan-Meier Methods specifies that all the confidence intervals are based on Brookmeyer and Crowley.   Here is the paragraph from the documentation:

"Brookmeyer and Crowley (1982) have constructed the confidence interval for the median survival time based on the confidence interval for the S(t). The methodology is generalized to construct the confidence interval for the 100pth percentile based on a g-transformed confidence interval for S(t)  (Klein and Moeschberger 1997). You can use the CONFTYPE= option to specify the g-transformation. "

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